EN 13041:1999/A1:2006

Soil improvers and growing media - Determination of physical properties - Dry bulk density, air volume, water volume, shrinkage value and total pore space

The amendment to EN 13041 covers the change in ring diameter and the results of the precision data for extra tensions.

Bodenverbesserungsmittel und Kultursubstrate - Bestimmung der physikalischen Eigenschaften - Rohdichte (trocken), Luftkapazität, Wasserkapazität, Schrumpfungswert und Gesamtporenvolumen

Amendements du sol et supports de culture - Détermination des propriétés physiques - Masse volumique apparente sèche, volume d'air, volume d'eau, valeur de rétraction et porosité totale

Izboljševalci tal in rastni substrati – Določanje fizikalnih lastnosti – prostorninske gostote (suhe), kapacitete za zrak, kapacitete za vodo, vrednosti skrčenja in celotne poroznosti

General Information

• Status: Withdrawn
• Publication Date: 20-Jun-2006
• Withdrawal Date: 01-Nov-2011
• ICS: 65.080 - Fertilizers
• Technical Committee: CEN/TC 223 - Soil improvers and growing media
• Drafting Committee: CEN/TC 223/WG 4 - Analytical methods
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 02-Nov-2011
• Completion Date: 02-Nov-2011
• Ref Project: SIST EN 13041:2001/A1:2006 - Soil improvers and growing media - Determination of physical properties - Dry bulk density, air volume, water volume, shrinkage value and total pore space

Relations

• Replaced By: EN 13041:2011 - Soil improvers and growing media - Determination of physical properties - Dry bulk density, air volume, water volume, shrinkage value and total pore space
• Effective Date: 05-Nov-2011
• Amends: EN 13041:1999 - Soil improvers and growing media - Determination of physical properties - Dry bulk density, air volume, water volume, shrinkage value and total pore space
• Effective Date: 08-Jun-2022

Standards Content (Sample)

SLOVENSKI SIST EN
13041:2001/oprA1:2006
PREDSTANDARD
februar 2006
Izboljševalci tal in rastni substrati – Določanje fizikalnih lastnosti –
prostorninske gostote (suhe), kapacitete za zrak, kapacitete za vodo,
vrednosti skrčenja in celotne poroznosti
Soil improvers and growing media - Determination of physical properties - dry bulk
density, air volume, water volume, shrinkage value and total pore space
ICS 65.080 Referenčna številka
SIST EN 13041:2001/oprA1:2006(en)
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD
FINAL DRAFT
EN 13041:1999
NORME EUROPÉENNE
EUROPÄISCHE NORM
prA1
November 2005
ICS 65.080
English Version
Soil improvers and growing media - Determination of physical
properties - dry bulk density, air volume, water volume,
shrinkage value and total pore space
Bodenverbesserungsmittel und Kultursubstrate -
Bestimmung der physikalischen Eigenschaften - Rohdichte
(trocken), Luftkapazität, Wasserkapazität,
Schrumpfungswert und Gesamtporenvolumen
This draft amendment is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical Committee
CEN/TC 223.
This draft amendment A1, if approved, will modify the European Standard EN 13041:1999. If this draft becomes an amendment, CEN
members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this amendment
into the relevant national standard without any alteration.
This draft amendment was established by CEN in three official versions (English, French, German). A version in any other language made
by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status
as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13041:1999/prA1:2005: E
worldwide for CEN national Members.

EN 13041:1999/prA1:2005 (E)
Contents Page
Foreword. 3
4 Principle. 4
5.4 Sand suction table. 4
7 Procedure. 4
7.3 Suction –10 cm water pressure head. 4
7.5 Optional suction –50 and –100 cm water pressure head. 4
7.6 Drying. 5
7.5 Organic matter (W ). 5
om
7.6 Ash content (W ) .5
ash
8 Expression of results . 5
8.4 Particle density. 5
8.5 Total pore space . 5
8.6 Water volume. 5
8.7 Air volume. 6
9 Number of replicates. 6
Annex B (informative) Results of interlaboratory trial to determine the physical
characteristics . 8

EN 13041:1999/prA1:2005 (E)
Foreword
This document (EN 13041:1999/prA1:2005) has been prepared by Technical Committee CEN/TC 223
“Soil improvers and growing media”, the secretariat of which is held by BSI.
This document is currently submitted to the Unique Acceptance Procedure.

EN 13041:1999/prA1:2005 (E)
4 Principle
After the last sentence, add the following new sentence
After –10 cm water pressure head it is optional also to apply respectively –50 and –100 cm water
pressure head.
5.4 Sand suction table
Delete the existing text and substitute the following:
Prepare the sand suction table for example in accordance with annex A, using the fine sand to obtain
the required suction. The pressure head in the plastic tubes (minus 50 cm) is measured from the
bottom of the tube. The pressure head in the rings (minus 10 cm, −50 cm and –100 cm) is measured
from the middle of the lower ring (Figure A.3). The setting of the pressure head can be checked with a
tensiometer or pressure transducer.
7 Procedure
Modify the title of 7.3 as follows:
7.3 Suction –10 cm water pressure head
Delete existing 7.4.3 and 7.4.4. Add new 7.5 and 7.6 as follows:
7.5 Optional suction –50 and –100 cm water pressure head
NOTE After –10 cm water pressure head it is possible also to determine the air and water volume at –50
and –100 cm water pressure head. The following procedure (7.5) can be skipped if only values for water and air
volume at –10 cm are necessary.
7.5.1 Carefully place the ring to the sand bath (5.4) making sure there is contact between the sand
and the lower part of the ring. Cover the sand box and apply a minus 50 cm pressure head, measured
from the middle of the ring.
7.5.2 It is important to regularly check that no air bubbles are present in the suction level regulator
tubes.
7.5.3 Apply the suction until equilibrium is reached. A minimum of 48 h and up to 72 h is required.
7.5.4 Record the mass (m ).
7.5.5 Carefully place the ring to the sand bath (5.4) making sure there is contact between the sand
and the lower part of the ring. Cover the sand box and apply a minus 100 cm pressure head,
measured from the middle of the ring.
7.5.6 It is important to regularly check that no air bubbles are present in the suction level regulator
tubes.
7.5.7 Apply the suction until equilibrium is reached. A minimum of 48 h and up to 72 h is required.
7.5.8 Record the mass (m ).
EN 13041:1999/prA1:2005 (E)
7.6 Drying
7.6.1 Place in the drying oven (5.5) without altering the structure and dry at 103 °C ± 2 °C to
constant mass (m ).
7.6.2 Remove the ring and measure with a calliper gauge the mean height (quadruplicate
measurements) (h ) and mean diameter (triplicate measurements; top middle and bottom) (d ) of the
2 2
dried samples.
NOTE This procedure cannot be carried out with some granular materials because they do not retain their
shape on drying. In these cases, it is recommended to measure the height prior to drying.
7.5 Organic matter (W )
om
Renumber existing subclause as 7.7.
7.6 Ash content (W )
ash
Renumber existing subclause as 7.8.
8 Expression of results
8.4 Particle density
Delete the first line and replace with the following:
Calculate the particle density in duplicate using the following equation:
8.5 Total pore space
Correct equation 5 to read as follows:

D
BD
P=−11×00

s
P

D

Delete the existing definition of the term P and replace with the following:
D
P is the mean value of the particle density in kilograms per cubic metre (kg/m )
D
8.6 Water volume
Delete the existing text and replace with the following:
Calculate the water volume after applying minus 10 and optional at minus 50 and minus 100 cm
pressure head using the following equations:
()m −m
2 5
W at −10 cm pressure head = ×100 (7)
V
V
()m −m
3 5
W at −50 cm pressure head = ×100 (8)
V
V
EN 13041:1999/prA1:2005 (E)
()
m −m
4 5
W at −100 cm pressure head = ×100 (9)
V
V
Where
W is the water volume content expressed as a percentage by volume, % (V/V), wet sample at
v
minus 10, minus 50 or minus 100 centimetre pressure head;
V is the volume in cubic centimetres of the sample ring;
m is the mass in grams of the wet sample plus sample ring at minus 10 centimetre pressure
head;
m is the mass in grams of the wet sample plus sample ring at minus 50 centimetre pressure
head;
m is the mass in grams of the wet sample plus sample ring at minus 100 centimetre pressure
head;
m is the mass in grams of the dried sample plus sample ring.
8.7 Air volume
Delete the existing text and replace with the following:
Calculate the air volume content in the sample after applying minus 10 centimetre pressure head and
optional at minus 50 and minus 100 cm pressure head using the following equations:
A at −10 cm pressure head = P − W at −10 cm pressure head (10)
V s v
A at −50 cm pressure head = P − W at −50 cm pressure head (11)
V s v
A at −100 cm pressure head = P − W at −100 cm pressure head (12)
V s v
where
A is the air volumetric content expressed as a percentage by volume, % (V/V), wet sample at
v
minus 10, minus 50 or minus 100 centimetre pressure head;
P is the total pore space expressed as a percentage by volume, % (V/V), wet sample at minus
s
10 centimetre pressure head (as defined in 8.5);
W is the water volume content expressed as a percentage by volume, % (V/V), wet sample at
v
minus 10, −50 or −100 centimetre pressure (as defined in 8.6).
9 Number of replicates
Add a new paragraph as follows:
The calculation of the particle density should be carried out on the basis of two replicates on both
results to be reported.
EN 13041:1999/prA1:2005 (E)
Bibliography
Add
[4] Wever, G. 2005. Interlaboratory study EN-Methods. Analysis of Growing Media and Soil
Improvers, Amendment EN 13041 pressure heads -50 cm and -100 cm. CEN/TC 223 WG4
document N60.
Annex B
Add new annex B as follows:
EN 13041:1999/prA1:2005 (E)
Annex B
(informative)
Results of interlaboratory trial to determine the physical characteristics
Two interlaboratory trials were organized, one in 1995 and one in 2004, under the auspices of the European Committee for Standardization, to test the
procedure specified in this European Standard.
In both trials the number of laboratories given in Tables B.1 to B.10 determined the physical characteristics in three different types of samples. Unfertilized
peat/perlite, Composted coarse bark and Composted straw and domestic sewage were analysed in 1995. Fertilized peat/ vermiculite growing medium,
Coarse coir dust and Composted green waste were analysed in 2004 [4].
Table B.1 — Summary of the results of two interlaboratory trials for the determination of dry bulk density
Sample Unfertilized Composted Composted Fertilized Coarse coir Composted
peat/perlite coarse bark straw and peat/ dust green waste
domestic vermiculite
sewage growing
medium
Number of laboratories retained after eliminating outliers 10 11 12 15 16 15
Number of outliers (laboratories) 1 0 0 1 0 1
Mean value [kg/m] 102,5 190,6 322,3 174,8 72,2 281,7
Repeatability standard deviation, s [kg/m] 1,73 4,19 5,35 4,75 2,41 6,11
r
Repeatability relative standard deviation (%) 4,72 6,15 4,65 2,72 3,33 2,17
Repeatability limit, r = 2.8s [kg/m] 4,84 11,73 14,98 13,31 6,74 17,10
r
Reproducibility standard deviation, s [kg/m] 2,55 8,24 14,28 12,21 8,38 16,97
R
Reproducibility relative standard deviation (%) 6,98 12,11 12,40 6,98 11,61 6,02
Reproducibility limit, r = 2.8s [kg/m] 7,15 23,08 39,97 34,18 23,47 47,51
R
EN 13041:1999/prA1:2005 (E)
Table B.2 — Summary of the results of two interlaboratory trials for the determination of shrinkage
Sample Unfertilized Composted Composted Fertilized Coarse coir Composted
peat/perlite coarse bark straw and peat/ dust green waste
domestic vermiculite
sewage growing
medium
Number of laboratories retained after eliminating outliers 9 9 10 14 12 13
Number of outliers (laboratories) 0 0 0 0 2 1
Mean value [%v/v] 25.9 21.6 27.8 33.8 16.4 15.4
Repeatability standard deviation, s [%v/v] 0.58 1.05 1.02 1.82 1.93 1.70
r
Repeatability relative standard deviation (%) 6.30 13.57 10.27 5.38 11.78 11.05
Repeatability limit, r = 2.8s [%v/v] 1.63 2.93 2.85 5.10 5.42 4.76
r
Reproducibility standard deviation, s [%v/v] 5.48 3.24 2.45 5.40 7.32 4.46
R
Reproducibility relative standard deviation (%) 59.29 42.09 24.69 15.95 44.60 29.00
Reproducibility limit, r = 2.8s [%v/v] 15.33 9.08 6.85 15.12 20.50 12.49
R
EN 13041:1999/prA1:2005 (E)
Table B.3 — Summary of the results of two interlaboratory trials for the determination particle density
Sample Unfertilized Composted Composted Fertilized Coarse coir Composted
peat/perlite coarse bark straw and peat/ dust green waste
domestic vermiculite
sewage growing
medium
Number of laboratories retained after eliminating outliers 9 10 11 8 9 10
Number of outliers (laboratories) 2 1 1 6 5 4
Mean value [kg/m] 1691 1728 2005 1898 1579 2056
Repeatability standard deviation, s [kg/m] 9.51 12.60 11.86 2.41 0.64 23.70
r
Repeatability r
...

SLOVENSKI STANDARD
01-september-2006
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Soil improvers and growing media - Determination of physical properties - Dry bulk
density, air volume, water volume, shrinkage value and total pore space
Bodenverbesserungsmittel und Kultursubstrate - Bestimmung der physikalischen
Eigenschaften - Rohdichte (trocken), Luftkapazität, Wasserkapazität, Schrumpfungswert
und Gesamtporenvolumen
Amendements du sol et supports de culture - Détermination des propriétés physiques -
Masse volumique apparente seche, volume d'air, volume d'eau, valeur de rétraction et
porosité totale
Ta slovenski standard je istoveten z: EN 13041:1999/A1:2006
ICS:
65.080
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 13041:1999/A1
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2006
ICS 65.080
English Version
Soil improvers and growing media - Determination of physical
properties - Dry bulk density, air volume, water volume,
shrinkage value and total pore space
Amendements du sol et supports de culture - Bodenverbesserungsmittel und Kultursubstrate -
Détermination des propriétés physiques - Masse volumique Bestimmung der physikalischen Eigenschaften - Rohdichte
apparante sèche, volume d'air, volume d'eau, valeur de (trocken), Luftkapazität, Wasserkapazität,
rétraction et porosité totale Schrumpfungswert und Gesamtporenvolumen
This amendment A1 modifies the European Standard EN 13041:1999; it was approved by CEN on 18 May 2006.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this
amendment into the relevant national standard without any alteration. Up-to-date lists and bibliographical references concerning such
national standards may be obtained on application to the Central Secretariat or to any CEN member.
This amendment exists in three official versions (English, French, German). A version in any other language made by translation under the
responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13041:1999/A1:2006: E
worldwide for CEN national Members.

Contents Page
Foreword. 3
4 Principle. 4
5.4 Sand suction table . 4
7 Procedure. 4
7.3 Suction –10 cm water pressure head. 4
7.5 Optional suction –50 and –100 cm water pressure head. 4
7.6 Drying. 5
7.5 Organic matter (W ) . 5
om
7.6 Ash content (W ). 5
ash
8 Expression of results. 5
8.4 Particle density. 5
8.5 Total pore space. 5
8.6 Water volume. 5
8.7 Air volume. 6
9 Number of replicates . 6
Annex B (informative) Results of interlaboratory trial to determine the physical
characteristics. 8

Foreword
This document (EN 13041:1999/A1:2006) has been prepared by Technical Committee CEN/TC 223
“Soil improvers and growing media”, the secretariat of which is held by BSI.
This Amendment to the European Standard EN 13041:1999 shall be given the status of a national
standard, either by publication of an identical text or by endorsement, at the latest by December 2006,
and conflicting national standards shall be withdrawn at the latest by December 2006.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.

4 Principle
After the last sentence, add the following new sentence
After –10 cm water pressure head it is optional also to apply –50 and –100 cm water pressure head
respectively.
5.4 Sand suction table
Delete the existing text and substitute the following:
For example prepare the sand suction table in accordance with Annex A, using the fine sand to obtain
the required suction. The pressure head in the plastic tubes (–50 cm) is measured from the bottom of
the tube. The pressure head in the rings (–10 cm, −50 cm and –100 cm) is measured from the middle
of the lower ring (Figure A.3). The setting of the pressure head can be checked with a tensiometer or
pressure transducer.
7 Procedure
Modify the title of 7.3 as follows:
7.3 Suction –10 cm water pressure head
Delete existing 7.4.3 and 7.4.4. Add new 7.5 and 7.6 as follows:
7.5 Optional suction –50 and –100 cm water pressure head
NOTE After –10 cm water pressure head it is possible also to determine the air and water volume at –50
and –100 cm water pressure head. The following procedure (7.5) can be skipped only if values for water and air
volume at –10 cm are necessary.
7.5.1 Carefully place the ring to the sand bath (5.4) making sure there is contact between the sand
and the lower part of the ring. Cover the sand box and apply a –50 cm pressure head, measured from
the middle of the ring.
7.5.2 It is important to regularly check that no air bubbles are present in the suction level regulator
tubes.
7.5.3 Apply the suction until equilibrium is reached. A minimum of 48 h and up to 72 h is required.
7.5.4 Record the mass (m ).
7.5.5 Carefully place the ring to the sand bath (5.4) making sure there is contact between the sand
and the lower part of the ring. Cover the sand box and apply a –100 cm pressure head, measured
from the middle of the ring.
7.5.6 It is important to regularly check that no air bubbles are present in the suction level regulator
tubes.
7.5.7 Apply the suction until equilibrium is reached. A minimum of 48 h and up to 72 h is required.
7.5.8 Record the mass (m ).
7.6 Drying
7.6.1 Place in the drying oven (5.5) without altering the structure and dry at (103 ± 2) °C to constant
mass (m ).
7.6.2 Remove the ring and measure with a calliper gauge the mean height (quadruplicate
measurements) (h ) and mean diameter (triplicate measurements; top middle and bottom) (d ) of the
2 2
dried samples.
NOTE This procedure cannot be carried out with some granular materials because they do not retain their
shape on drying. In these cases, it is recommended to measure the height prior to drying.
7.5 Organic matter (W )
om
Renumber existing subclause as 7.7.
7.6 Ash content (W )
ash
Renumber existing subclause as 7.8.
8 Expression of results
8.4 Particle density
Delete the first line and replace with the following:
Calculate the particle density in duplicate using the following equation:
8.5 Total pore space
Correct equation 5 to read as follows:

D
BD
P=−1 ×100

s
P

D

Delete the existing definition of the term P and replace with the following:
D
P is the mean value of the particle density in kilograms per cubic metre (kg/m )
D
8.6 Water volume
Delete the existing text and replace with the following:
Calculate the water volume after applying –10 and optional at –50 and –100 cm pressure head using
the following equations:
()m −m
2 5
W at −10 cm pressure head = ×100 (7)
V
V
()m −m
3 5
W at −50 cm pressure head = ×100 (8)
V
V
()m −m
4 5
W at −100 cm pressure head = ×100 (9)
V
V
where
W is the water volume content expressed as a percentage by volume, % (V/V), wet sample at
v
−10, −50 or −100 centimetre pressure head;
V is the volume in cubic centimetres of the sample ring;
m is the mass in grams of the wet sample plus sample ring at −10 centimetre pressure head;
m is the mass in grams of the wet sample plus sample ring at −50 centimetre pressure head;
m is the mass in grams of the wet sample plus sample ring at −100 centimetre pressure head;
m is the mass in grams of the dried sample plus sample ring.
8.7 Air volume
Delete the existing text and replace with the following:
Calculate the air volume content in the sample after applying –10 centimetre pressure head and
optional at –50 and –100 cm pressure head using the following equations:
A at −10 cm pressure head = P − W at −10 cm pressure head (10)
V s v
A at −50 cm pressure head = P − W at −50 cm pressure head (11)
V s v
A at −100 cm pressure head = P − W at −100 cm pressure head (12)
V s v
where
A is the air volumetric content expressed as a percentage by volume, % (V/V), wet sample at –
v
10, –50 or –100 centimetre pressure head;
P is the total pore space expressed as a percentage by volume, % (V/V), wet sample at –10
s
centimetre pressure head (as defined in 8.5);
W is the water volume content expressed as a percentage by volume, % (V/V), wet sample at –
v
10, −50 or −100 centimetre pressure (as defined in 8.6).
9 Number of replicates
Add a new paragraph as follows:
The calculation of the particle density should be carried out on the basis of two replicates on both
results to be reported.
Bibliography
Add
[4] Wever, G. 2005. Interlaboratory study EN-Methods. Analysis of Growing Media and Soil
Improvers, Amendment EN 13041 pressure heads -50 cm and -100 cm. CEN/TC 223 WG4
document N60.
Annex B
Add new Annex B as follows:
Annex B
(informative)
Results of interlaboratory trial to determine the physical characteristics
Two interlaboratory trials were organized, one in 1995 and one in 2004, under the auspices of the European Committee for Standardization, to test the
procedure specified in this European Standard.
In both trials the number of laboratories given in Tables B.1 to B.10 determined the physical characteristics in three different types of samples. Unfertilized
peat/perlite, Composted coarse bark and composted straw and domestic sewage were analysed in 1995. Fertilized peat/vermiculite growing medium, coarse
coir dust and composted green waste were analysed in 2004 [4].
Table B.1 — Summary of the results of two interlaboratory trials for the determination of dry bulk density
Sample Unfertilized Composted Composted Fertilized Coarse coir Composted
peat/perlite coarse bark straw and peat/vermic dust green waste
domestic ulite
sewage growing
medium
Number of laboratories retained after eliminating outliers 10 11 12 15 16 15
Number of outliers (laboratories) 1 0 0 1 0 1
Mean value [kg/m] 102,5 190,6 322,3 174,8 72,2 281,7
Repeatability standard deviation, s [kg/m] 1,73 4,19 5,35 4,75 2,41 6,11
r
Repeatability relative standard deviation (%) 4,72 6,15 4,65 2,72 3,33 2,17
Repeatability limit, r = 2.8s [kg/m] 4,84 11,73 14,98 13,31 6,74 17,10
r
Reproducibility standard deviation, s [kg/m] 2,55 8,24 14,28 12,21 8,38 16,97
R
Reproducibility relative standard deviation (%) 6,98 12,11 12,40 6,98 11,61 6,02
Reproducibility limit, r = 2.8s [kg/m] 7,15 23,08 39,97 34,18 23,47 47,51
R
Table B.2 — Summary of the results of two interlaboratory trials for the determination of shrinkage
Sample Unfertilized Composted Composted Fertilized Coarse coir Composted
peat/perlite coarse bark straw and peat/vermic dust green waste
domestic ulite
sewage growing
medium
Number of laboratories retained after eliminating outliers 9 9 10 14 12 13
Number of outliers (laboratories) 0 0 0 0 2 1
Mean value [%v/v] 25.9 21.6 27.8 33.8 16.4 15.4
Repeatability standard deviation, s [%v/v] 0.58 1.05 1.02 1.82 1.93 1.70
r
Repeatability relative standard deviation (%) 6.30 13.57 10.27 5.38 11.78 11.05
Repeatability limit, r = 2.8s [%v/v] 1.63 2.93 2.85 5
...